AIIMS 2019 Chemistry Rate of Reaction MCQ Question
Assertion: The rate of reaction is never negative. Reason: Minus sign, used in expressing the rate, shows that concentration of products is decreasing.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The assertion that "the rate of reaction is never negative" is true because reaction rates are defined as the change in concentration of reactants or products over time, which yields a positive value. However, the reason is false because while the rate of reaction cannot be negative, it can be zero when a reaction has reached equilibrium or is not occurring. Options A and B are incorrect because they assume the reason is true, while option D is incorrect as it dismisses the truth of the assertion. Understanding that reaction rates are always non-negative helps clarify concepts in kinetics and equilibrium in chemical reactions.
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